Emulsion having high silver chloride content, photographic recording material and process for the production of photographic recordings

Abstract

A chloride-rich silver halide emulsion with grains having in the interior thereof a zone having a high bromide content is described.

I claim: 
     
       1. Photographic silver halide emulsion in which the halide content consists substantially of chloride and the grains having at least one zone Z Br  having a high bromide content, comprising (1) at least 60 mol % of the halide is chloride;   (2) the zone Z Br  is positioned between a core and the surface layer of the grain;   (3) the bromide content in the zone Z Br  amounts to at least 50 mol %; and   (4) no bromide-rich Zone Z Br  is present on the surface of the silver halide grains.   
     
     
       2. Photographic silver halide emulsion according to claim 1, wherein at least 85 mol % of the total halide present is chloride. 
     
     
       3. Photographic silver halide emulsion according to claim 1, wherein the halide in the bromide-rich zone Z Br  consists substantially or exclusively of silver bromide. 
     
     
       4. Photographic silverhalide emulsion according to claim 1, wherein the average grain size is from 0.1 to 2.5 μm. 
     
     
       5. Photographic silver halide emulsion according to claim 1, wherein it has a narrow grain size distribution. 
     
     
       6. Photographic silver halide emulsion according to claim 1, wherein the emulsion has a wide grain size distribution. 
     
     
       7. Photographic silver halide emulsion according to claim 1, wherein it is chemically and spectrally sensitized on the surface. 
     
     
       8. Color photographic recording material comprising a support and at least one silver halide emulsion layer applied thereto, and at least one color coupler, wherein the grains of said emulsion comprises at least 60 mol percent of chloride and a zone Z Br  with a Br content of at least 50 mol percent is positioned between a core and the surface layer of the grain and wherein no zone Z Br  is present on the surface of the grains. 
     
     
       9. A process of producing photographic recording by development of an exposed recording material having at least one supported silver halide emulsion layer and at least one color coupler, wherein the grains of said emulsion comprises at least 60 mol percent of chloride and a zone Z Br  with a Br content of at least 50 mol percent is positioned between a core and the surface layer of the grain and wherein no zone Z Br  is present on the surface of the grains,   wherein the development of the exposed recording material is in the presence of a p-phenylene diamine.